Is there a name for a node that doesn't have any edges?

Question

Consider the following graph (in graphviz)

graph {
  a
  b - c
  d
  e - f -g
}

This is a disconnected graph. One could describe this graph as a forest with 4 trees.

Is there any name for the nodes b and d that aren't connected to anything else? like solo nodes or isolated nodes or something like that?

Answer 1

This is known as an isolated node or isolated vertex.